Functioin: 8-channel alarm function There are 8-channel alarm inputs,please operates as figure 1.1 for correct connection. The arm will sound as soon as short circuit occurred between input signal (S) and GND . 4-channel relay outputs function  There are 4 channel relay outputs (k1,k2,k3,k4),the contact capacity is DC24V/1A.The relay ON and OFF can be controlled. RS232/RS485 bi-directional converter (number 1of DB25 is RS485A, 14 is RS485B) This bi-directional converter transform the RS232 signal to RS485 and the RS485 signal to RS232 in half duplex mode. Watchdog function There are two REST on the card , please operates as figure1.0 for correct connection. There will have heartbeat signal outputted as soon as digital video recorder activated, otherwise the card will send out reset signal to reset the digital video recorder if it can not receive heartbeat signals in stipulated time. Features:

Power supply: 12v is supplied by computer, power consumption: 200mW. Connect capacity of output relay: DC24V/1A Auto-reset interval time: 1-256 seconds (can be set) Converter working mode: half-duplex Converter communication speed: 300-115200 bits/S Converter communication distance: 1200 meters Converter connected quantity: 32 or 127

LED Indication There are three LED on board(see figure1.0). CODE:the LED blinking means communication is in normal status ALARM:the LED longlight means arming  POWER:the LED light means power on